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          CHAPTER 9                                                            Multimedia Features




FIGURE 9.13 Rendering of the 3D artwork using View4 (cross section rotated around the y axis by -30 degrees and
                                        around the z axis by 30 degrees)


          Figure 9.13 shows the cross section specified for the 3DView that references
          CrossSection4. This cross section specifies a plane that differs from the one speci-
          fied in CrossSection1 (Figure 9.10) in the following way:
          • Perpendicular to the X axis, rotated -30 degrees around the Y axis, and rotated
             30 degrees around the Z axis: /O [ null -30 30]

          3D Node Dictionaries

          A 3D view can specify a 3D node dictionary (PDF 1.7), which specifies particular
          areas of 3D artwork and the opacity and visibility with which individual nodes
          are displayed. The 3D artwork is contained in the parent 3D stream object. The
          NA entry of the 3D views dictionary can specify multiple 3D node dictionaries for
          a particular view.

          While many PDF dictionaries reference 3D artwork in its entirety, it is often use-
          ful to reference 3D artwork at a more granular level. This enables properties such
          as visibility, opacity, and orientation to be applied to subsets of the 3D artwork.

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